A case of intracranial hemorrhage caused by combined dabrafenib and trametinib therapy for metastatic melanoma.

Lee le M, Feun L, Tan Y - Am J Case Rep (2014)

Bottom Line:
Intracranial hemorrhage was found intra-operatively.Pathology from surgery did not find tumor cells, reported as organizing hemorrhage and necrosis with surrounding gliosis; immunohistochemistry for S100 and HMB45 were negative.This case demonstrates the life-threatening adverse effects that can be seen with the newer targeted biological therapies.

Affiliation: Department of Internal Medicine, University of Miami, Miami, USA.

ABSTRACT

Background: Combination therapy with BRAF V600E inhibitor dabrafenib and MEK inhibitor trametinib significantly improves progression-free survival of patients with BRAF V600-positive metastatic melanoma, but their use can be associated with life-threatening toxicities. We report the case of a patient receiving dabrafenib and trametinib for metastatic melanoma who developed intracranial hemorrhage while on therapy. Combination therapy with dabrafenib and trametinib improves progression-free survival of patients with BRAF V600-positive metastatic melanoma. Nevertheless, it is associated with an increased incidence and severity of any hemorrhagic event. To the best of our knowledge, this is the first report of intracranial hemorrhage with pathological confirmation.

Case report: We present the case of a 48-year-old man with metastatic melanoma of unknown primary site. He had metastases to the right clavicle, brain, liver, adrenal gland, and the right lower quadrant of the abdomen. He progressed on treatment with alpha-interferon. He was found to have a 4.5-cm mass in the left frontotemporal lobe and underwent gross total resection followed by adjuvant CyberKnife stereotactic irradiation. He was subsequently started on ipilimumab. Treatment was stopped due to kidney injury. He was then placed on dabrafenib and trametinib. He returned for follow-up complaining of severe headache and developed an episode of seizure. MRI showed a large area of edema at the left frontal lobe with midline shift. Emergency craniotomy was performed. Intracranial hemorrhage was found intra-operatively. Pathology from surgery did not find tumor cells, reported as organizing hemorrhage and necrosis with surrounding gliosis; immunohistochemistry for S100 and HMB45 were negative.

Conclusions: This case demonstrates the life-threatening adverse effects that can be seen with the newer targeted biological therapies. It is therefore crucial to maintain a high index of suspicion when patients on this combination therapy present with new neurologic symptoms.

f2-amjcaserep-15-441: A 2×1×0.1 cm surgical specimen was submitted for histology. Multiple levels, including deeper sections, were evaluated as follows: 2 levels were evaluated during intra-operative consult (frozen section) and 3 levels were evaluated from the paraffin section. An additional 2 levels were stained negative for S100 and HMB45.

Mentions:
A 48-year-old man initially presented with a right clavicular node in 2001; pathology revealed metastatic melanoma. The primary site was unknown. He proceeded to have 1 full year of treatment with alpha-interferon. He presented in July 2013 with headaches and a CT of the brain revealed a 4.5-cm mass in the left frontotemporal lobe. He underwent gross total resection, with pathology demonstrating metastatic melanoma. He subsequently underwent adjuvant CyberKnife stereotactic irradiation. A PET scan at this time showed disease in the liver, left adrenal gland, and the right lower quadrant of the abdomen. He was started on treatment with ipilimumab in September 2013, which was stopped in October 2013 after 1 dose due to non-resolving kidney injury. He was then started on dabrafenib and trametinib in the same month. He reported mild nausea, vomiting, and fatigue with the initiation of targeted therapy. A PET scan in January 2014 showed post-surgical changes within the brain, interval improvement in hypermetabolic activity within the left adrenal and right lower quadrant mass, and heterogeneous liver uptake without focal area of hypermetabolism. There was a new hypermetabolic focus within the right distal tibia and a soft tissue lesion within the left gluteal muscle. MRI of the right lower extremity demonstrated a 4.4×1.6×1.0 cm intramedullary lesion in the distal tibial diaphysis, with imaging findings suggesting osteonecrosis or cartilaginous tumor. The lesion did not have the typical imaging characteristics of metastatic melanoma. In February 2014, he returned for follow-up, complaining of severe, new left frontal headache. He developed an episode of witnessed seizure at the office and was sent for an emergent MRI of the brain. Non-contrast MRI was performed due to impaired kidney function. The MRI showed a large area of edema in the left frontal lobe, with midline shift (Figure 1). Emergency craniotomy was performed and intracranial hemorrhage was found intra-operatively. Pathology from surgery did not find tumor cells, reported as organizing hemorrhage and necrosis (Figure 2) with surrounding gliosis. Immunohistochemistry is often used as an aid in the diagnosis of melanoma. S-100 remains the most sensitive marker of melanocytes. S-100 and the more specific HMB45 are the most frequently used antibodies in formulating a diagnosis of melanoma [2]. Immunohistochemistry for S100 and HMB45 were negative in our patient (Figure 3). The patient regained full neurologic function post-operatively. A repeat MRI of the brain a month later demonstrated interval resolution of blood products.

f2-amjcaserep-15-441: A 2×1×0.1 cm surgical specimen was submitted for histology. Multiple levels, including deeper sections, were evaluated as follows: 2 levels were evaluated during intra-operative consult (frozen section) and 3 levels were evaluated from the paraffin section. An additional 2 levels were stained negative for S100 and HMB45.

Mentions:
A 48-year-old man initially presented with a right clavicular node in 2001; pathology revealed metastatic melanoma. The primary site was unknown. He proceeded to have 1 full year of treatment with alpha-interferon. He presented in July 2013 with headaches and a CT of the brain revealed a 4.5-cm mass in the left frontotemporal lobe. He underwent gross total resection, with pathology demonstrating metastatic melanoma. He subsequently underwent adjuvant CyberKnife stereotactic irradiation. A PET scan at this time showed disease in the liver, left adrenal gland, and the right lower quadrant of the abdomen. He was started on treatment with ipilimumab in September 2013, which was stopped in October 2013 after 1 dose due to non-resolving kidney injury. He was then started on dabrafenib and trametinib in the same month. He reported mild nausea, vomiting, and fatigue with the initiation of targeted therapy. A PET scan in January 2014 showed post-surgical changes within the brain, interval improvement in hypermetabolic activity within the left adrenal and right lower quadrant mass, and heterogeneous liver uptake without focal area of hypermetabolism. There was a new hypermetabolic focus within the right distal tibia and a soft tissue lesion within the left gluteal muscle. MRI of the right lower extremity demonstrated a 4.4×1.6×1.0 cm intramedullary lesion in the distal tibial diaphysis, with imaging findings suggesting osteonecrosis or cartilaginous tumor. The lesion did not have the typical imaging characteristics of metastatic melanoma. In February 2014, he returned for follow-up, complaining of severe, new left frontal headache. He developed an episode of witnessed seizure at the office and was sent for an emergent MRI of the brain. Non-contrast MRI was performed due to impaired kidney function. The MRI showed a large area of edema in the left frontal lobe, with midline shift (Figure 1). Emergency craniotomy was performed and intracranial hemorrhage was found intra-operatively. Pathology from surgery did not find tumor cells, reported as organizing hemorrhage and necrosis (Figure 2) with surrounding gliosis. Immunohistochemistry is often used as an aid in the diagnosis of melanoma. S-100 remains the most sensitive marker of melanocytes. S-100 and the more specific HMB45 are the most frequently used antibodies in formulating a diagnosis of melanoma [2]. Immunohistochemistry for S100 and HMB45 were negative in our patient (Figure 3). The patient regained full neurologic function post-operatively. A repeat MRI of the brain a month later demonstrated interval resolution of blood products.

Bottom Line:
Intracranial hemorrhage was found intra-operatively.Pathology from surgery did not find tumor cells, reported as organizing hemorrhage and necrosis with surrounding gliosis; immunohistochemistry for S100 and HMB45 were negative.This case demonstrates the life-threatening adverse effects that can be seen with the newer targeted biological therapies.

Affiliation:
Department of Internal Medicine, University of Miami, Miami, USA.

ABSTRACT

Background: Combination therapy with BRAF V600E inhibitor dabrafenib and MEK inhibitor trametinib significantly improves progression-free survival of patients with BRAF V600-positive metastatic melanoma, but their use can be associated with life-threatening toxicities. We report the case of a patient receiving dabrafenib and trametinib for metastatic melanoma who developed intracranial hemorrhage while on therapy. Combination therapy with dabrafenib and trametinib improves progression-free survival of patients with BRAF V600-positive metastatic melanoma. Nevertheless, it is associated with an increased incidence and severity of any hemorrhagic event. To the best of our knowledge, this is the first report of intracranial hemorrhage with pathological confirmation.

Case report: We present the case of a 48-year-old man with metastatic melanoma of unknown primary site. He had metastases to the right clavicle, brain, liver, adrenal gland, and the right lower quadrant of the abdomen. He progressed on treatment with alpha-interferon. He was found to have a 4.5-cm mass in the left frontotemporal lobe and underwent gross total resection followed by adjuvant CyberKnife stereotactic irradiation. He was subsequently started on ipilimumab. Treatment was stopped due to kidney injury. He was then placed on dabrafenib and trametinib. He returned for follow-up complaining of severe headache and developed an episode of seizure. MRI showed a large area of edema at the left frontal lobe with midline shift. Emergency craniotomy was performed. Intracranial hemorrhage was found intra-operatively. Pathology from surgery did not find tumor cells, reported as organizing hemorrhage and necrosis with surrounding gliosis; immunohistochemistry for S100 and HMB45 were negative.

Conclusions: This case demonstrates the life-threatening adverse effects that can be seen with the newer targeted biological therapies. It is therefore crucial to maintain a high index of suspicion when patients on this combination therapy present with new neurologic symptoms.